National Heart, Lung, and Blood Institute (NHLBI)http://www.nhlbi.nih.govThe NHLBI provides the public with educational resources relating to the treatment of heart, blood vessel, lung, and blood diseases as well as sleep disorders.

Sickle Cell Disease Association of Americahttp://www.sicklecelldisease.orgThis group provides education, advocacy, and other initiatives to promote awareness of and support for sickle cell disease programs.

American Association of Blood Bankshttp://www.aabb.orgThis site of the American Association of Blood Banks describes blood banking and transfusions.